Cloud CXM User's Guide download pdf (Page 15)

CXM Technical

MANUAL

4.14 PFL Output

A -2dBu PFL output is provided on a stereo pair of phono sockets. This signal is derived

from the PFL and split cue circuits. The output is identical to the signal on the headphone

output though it is not affected by the phones volume control.

4.15 Remote Music Mute

In certain circumstances, there may be a local authority or Fire Service requirement to

mute the Music Signals via a Fire alarm control panel in an alarm condition.

The CXM M2 provides a facility to mute the music signals. The option to mute mic signals

in addition to the music signals is set by means of J2 (see diagram). The mute is

activated by a fully floating pair of contacts in the Fire alarm control panel which close

during an alarm condition. Do not connect any external voltage sources either AC or DC

to the remote music mute connector. Should the alarm panel not have suitable set of

contacts then it is usual to use an auxiliary relay. Do not attempt to modify the fire alarm

circuits unless you are both qualified and authorised to do so.

To indicate that the remote music mute is active, the red LED on the front panel will flash

and any current PFL selection will be cancelled, effectively muting the headphone

amplifier.

Note. It is normal for the music mute to operate for a few seconds when the mixer is

switched on.

4.16 Emergency signal input

This facility is provided so that pre recorded evacuation message systems can be

interfaced to the M2, allowing messages to be broadcast over the main sound re-

enforcement system. It should be noted that it is unlikely that the main sound re-

enforcement system will meet the regulations necessary for such an application and

therefore this facility should only be used to augment an existing, adequate broadcast

system.

The emergency signal input is a 3 pin XLR, with an adjacent gain control to accommodate

signal levels between +/- 12dBu. The input impedance is 10kOhms. The signal is directly

routed to the output stages of the main output, the music output and output 2 with an

nominal output level of 0dBu. This facility is NOT present on any other M2 outputs

including the outputs of the zone module CZ1. The signal level is not affected by any of

the front panel controls.

In order to prevent unwanted noise from the equipment connected to this input reaching

the outputs under normal operating conditions the signal can be gated by the remote

music mute. This facility can be selected by means of a jumper J1. The default position

for this jumper is ON. When this facility is enabled the emergency signal is only routed to

the outputs when the remote mute is activated. As the emergency signal is routed to the

main outputs it is strongly recommended that this ‘gated mode’ is used, particularly if the

signal source is either low level, noisy, unbalanced or of questionable integrity. Using this

input without the gate is highly likely to raise the noise levels on the outputs.

4.17 Mono/Sub-bass output

This balanced output facility uses a 3 pole 1/4" jack socket and can be configured on the

PCB to operate as a mono full range main output (see diagram) or as a mono sub-bass

output to drive amplifiers with sub-bass enclosures to enhance the lowest frequencies

within the audio spectrum. The output level is 0dBu and the low pass filter operates below

63Hz. A 2 pole jack plug can be used for unbalanced signals. The factory default setting

is the mono full range output.

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Cloud CXM User's Guide Page 15

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